Son has come back with more information. He can get a straight exchange it seems for the Rikky 330 and a PRS Sera but he is not keen on its Bigbsy trem. The shop has a Mira but that will be money as well as the 330.

Now I KNOW it is a "bit of string" but any ideas on the value of a 330 in good condition?

But in for a penny, I was 6 in 1979 and yes, I sadly suspect that is a vintage guitar now.

For balance the shoe is often on the other foot, for instance a young colleague recently discovered I own a "vintage" Kangol hat which was bought in 1994. They're now in fashion again (the hat, not me) so she wanted mine, which I nearly gave her until I realised the hat was 5 years older than she is...